<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <form action="">
        用户名: <input type="text" required="required" placeholder="请输入用户名" autofocus="autofocus" name="username" autocomplete="off"> <input type="submit" value="提交"> 上传头像: <input type="file" name="" id="" multiple="multiple">
    </form>
</body>

</html>